Signatures of Unconventional Superconductivity in Granular Aluminum

N. Bachar, U. S. Pracht, E. Farber, M. Dressel, G. Deutscher, M. Scheffler

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We present measurements of the complex transmission of superconducting granular aluminum thin films in the THz optical range. We discuss the dynamical conductivity and temperature-dependent energy gap of two films of different granular coupling. While the film of well-coupled grains follows the predictions for a conventional BCS superconductor, signatures of enhanced absorption are found at sub-gap frequencies when coupling is decreased. We discuss possible explanations which might account for the observed deviations from BCS theory.

Original languageEnglish
Pages (from-to)83-89
Number of pages7
JournalJournal of Low Temperature Physics
Issue number1-2
StatePublished - Apr 2015


  • Granular aluminum
  • THz spectroscopy
  • Unconventional superconductivity


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